<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
</head>

<body style="margin: 50px;">
    <table border="1" width="1000">
        <tr style="background-color: #999;">
            <th><input type="checkbox"></th>
            <th>分类ID</th>
            <th>分类名称</th>
            <th>分类描述</th>
            <th>操作</th>
        </tr>
        <tr>
            <td align="center"><input type="checkbox" name="chekbox"></td>
            <td>1</td>
            <td>手机数码</td>
            <td>手机数码类商品</td>
            <td><a href="">修改</a>|<a href="">删除</a></td>
        </tr>
        <tr>
            <td align="center"><input type="checkbox" name="chekbox"></td>
            <td>2</td>
            <td>电脑办公</td>
            <td>电脑办公类商品</td>
            <td><a href="">修改</a>|<a href="">删除</a></td>
        </tr>
        <tr>
            <td align="center"><input type="checkbox" name="chekbox"></td>
            <td>3</td>
            <td>鞋靴箱包</td>
            <td>鞋靴箱包类商品</td>
            <td><a href="">修改</a>|<a href="">删除</a></td>
        </tr>
        <tr>
            <td align="center"><input type="checkbox" name="chekbox"></td>
            <td>4</td>
            <td>家居饰品</td>
            <td>家居饰品类商品</td>
            <td><a href="">修改</a>|<a href="">删除</a></td>
        </tr>
    </table>
</body>
<script type="text/javascript">
    let element = document.querySelectorAll("tr")
    for (let i = 1; i < element.length; i++) {
        let oTr = element[i];
        oTr.onmousemove = function () {
            this.style.backgroundColor = "yellow"
        }
        oTr.onmouseout = function () {
            this.style.backgroundColor = "white"
        }
    }
</script>
</html>